NASA handout image shows an artist's concept of the Gravity Recovery and Interior Laboratory mission's twin spacecraft in orbit around the moon. The GRAIL mission will fly the spacecraft, in the same orbit, over areas of greater and lesser gravity, caused both by visible features such as mountains

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Astronaut Eugene A. Cernan, Apollo 17 commander, is photographed inside the lunar module on the lunar surface following the second extravehicular activity of his mission. Note lunar dust on his suit. The photograph was taken by astronaut Harrison H. Schmitt, lunar module pilot, using a 70mm handhel

epa03370011 An July 1969 picture provided by NASA shows US astronaut Neil A. Armstrong, commander of the Apollo 11 Lunar Landing mission in his space suit, with his helmet on the table in front of him. Behind him is a large photograph of the lunar surface. Astronaut Neil Armstrong, 82, the first man